Refer to the figure below to answer numbers 17 – 20. a R 17.Which of the following refers to the angle R shown in the figure? A. angle of elevation B. angle of depression C. complementary angle D. supplementary angle 18.Line segment i in the figure above is referred to as what? A. horizontal line B. line of sight C. reference line D. vertical line 19. Using the concept of right angles, what is line segment a with angle R as the reference angle? A. adjacent line B. horizontal line C. hypotenuse D. opposite line

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Average

In mathematics, everyone must have heard the term average in one place or other. Almost all types of calculation require taking out an average. In everyday life, the term is used for denoting a certain amount that can be said to be a typical quantity for multiple people or objects. In other words, if a group of people possesses a certain object, then the average gives us an idea regarding the quantity of the object possessed by each person. However, this is solely based on mathematical calculation. It is important to note that most people will not strictly have the average value in a group.